chrome/common/extensions/extension_icon_set.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/common/extensions/extension_icon_set.h"
   6
   7 #include "base/logging.h"
   8
   9 ExtensionIconSet::ExtensionIconSet() {}
  10
  11 ExtensionIconSet::~ExtensionIconSet() {}
  12
  13 void ExtensionIconSet::Clear() {
  14   map_.clear();
  15 }
  16
  17 void ExtensionIconSet::Add(int size, const std::string& path) {
  18   DCHECK(!path.empty() && path[0] != '/');
  19   map_[size] = path;
  20 }
  21
  22 std::string ExtensionIconSet::Get(int size, MatchType match_type) const {
  23   // The searches for MATCH_BIGGER and MATCH_SMALLER below rely on the fact that
  24   // std::map is sorted. This is per the spec, so it should be safe to rely on.
  25   if (match_type == MATCH_EXACTLY) {
  26     IconMap::const_iterator result = map_.find(size);
  27     return result == map_.end() ? std::string() : result->second;
  28   } else if (match_type == MATCH_SMALLER) {
  29     IconMap::const_reverse_iterator result = map_.rend();
  30     for (IconMap::const_reverse_iterator iter = map_.rbegin();
  31          iter != map_.rend(); ++iter) {
  32       if (iter->first <= size) {
  33         result = iter;
  34         break;
  35       }
  36     }
  37     return result == map_.rend() ? std::string() : result->second;
  38   } else {
  39     DCHECK(match_type == MATCH_BIGGER);
  40     IconMap::const_iterator result = map_.end();
  41     for (IconMap::const_iterator iter = map_.begin(); iter != map_.end();
  42          ++iter) {
  43       if (iter->first >= size) {
  44         result = iter;
  45         break;
  46       }
  47     }
  48     return result == map_.end() ? std::string() : result->second;
  49   }
  50 }
  51
  52 bool ExtensionIconSet::ContainsPath(const std::string& path) const {
  53   return GetIconSizeFromPath(path) != 0;
  54 }
  55
  56 int ExtensionIconSet::GetIconSizeFromPath(const std::string& path) const {
  57   if (path.empty())
  58     return 0;
  59
  60   DCHECK(path[0] != '/') <<
  61       "ExtensionIconSet stores icon paths without leading slash.";
  62
  63   for (IconMap::const_iterator iter = map_.begin(); iter != map_.end();
  64        ++iter) {
  65     if (iter->second == path)
  66       return iter->first;
  67   }
  68
  69   return 0;
  70 }